Amid 3,000 acres of corn and soybeans and miles from the closest town, a Predator drone led to the arrests of farmer Rodney Brossart and five members of his family last year after a dispute over a neighbor’s six lost cows on his property escalated into a 16-hour standoff with police.

It is one of the first reported cases in the nation where an unmanned drone was used to assist in the arrest of a U.S. citizen on his own property; and a controversial sign of how drones, in all shapes, sizes and missions, are beginning to hover over American skies.

“All the pieces appear to be lining up for the eventual introduction of routine aerial surveillance in American life — a development that would profoundly change the character of public life in the United States,” the American Civil Liberties Union warned in a policy paper on drones last year titled, “Protecting Privacy From Aerial Surveillance.”